Theory and main parameters

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Theory and main parameters

Theory of Protection
The operating principle of the thermal protector is simple and effective. At the heart of the protector is a bimetal snap-action disc. When the temperature of this disc reaches its pre-calibrated temperature it snaps open, resulting in an open circuit. This temperature is reached during a fault condition, caused by either an increase in ambient temperature, an increase in current flowing through the disc, or a combination of both. After thermal protector breaks the circuit, the system cools and it automatically resets allowing power to be restored to the circuit.


Opening Temperature
The temperature at which thermal protector makes the circuit open.


Reset Temperature
The temperature at which thermal protector reset the circuit as it cools.


Maximum Contact Ratings:
The cycles of thermal protector reverts the circuit from open to reset when it works
under rated current and voltage.